Preheat oven to 350°F. Grease a standard 9x5-inch loaf pan and set aside.
In a large mixing bowl, combine brownie mix, chocolate chips, and walnuts. Stir to coat mix-ins evenly.
1 box brownie mix, ½ cup semi-sweet chocolate chips, ½ cup chopped walnuts
Add olive oil, eggs, and mashed bananas.
⅓ cup vegetable oil, 2 large eggs, 1 cup mashed bananas
Mix just until combined. Avoid overmixing.
Pour batter into prepared loaf pan and spread evenly.
Bake for 55-60 minutes. Check at 30 minutes. If browning too quickly, loosely tent with foil.
Bread is done when a toothpick inserted in the center comes out clean or with a few moist crumbs.
Cool in pan for 15-20 minutes before slicing.
Serve as is, or warm slightly before serving.
Notes
🥡 STORAGE: Store at room temperature in an airtight container for up to 2 daysRefrigerate for up to 4 days in a sealed containerCool completely before storing to prevent excess moisture♨️ REHEATING: Microwave individual slices for 10-15 secondsWarm in oven at 300°F for 5-8 minutesHeat the air fryer at 300°F for 3-4 minutes❄️ FREEZING: Wrap tightly in plastic wrap and foilFreeze whole loaf or individual slices for up to 3 monthsThaw at room temperature before serving💡 TIPS FOR BEST RESULTS: Use overripe bananas for deeper flavor and sweetnessDo not overmix to keep the loaf tenderTent with foil if the top browns too quicklyLet cool before slicing for clean cuts🍳 ALTERNATE COOKING METHODS: Bake in muffin pan at 350°F for 18-22 minutesBake in mini loaf pans at 350°F for 30-40 minutes♻️ LEFTOVERS: Crumble over ice cream for a sundae toppingCube and layer into parfaitsToast lightly and spread with peanut butter📝 NOTES: Serve with a dusting of powdered sugar if desiredWarm slightly and top with ice cream or whipped creamAdd different nuts or flavored chips for variationDrizzle chocolate glaze over the cooled loaf for extra richnessThis loaf slices best after it has fully cooledTry turning this into muffins for bake sales or lunch boxes